Downy mildew resistance of the cucumber germplasm collection in North Carolina field tests

Downy mildew [Pseudoperonospora cubensis (Berk. and Curt.) Rostov] is an important disease in most cucumber (Cucumis sativus L.) production areas of the world. Resistant cultivars are available, but higher levels of resistance are needed if yield losses are to be avoided. The objective of this exper...

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Bibliographic Details
Published inCrop science Vol. 37; no. 4
Main Authors Wehner, T.C, Shetty, N.V
Format Journal Article
LanguageEnglish
Published 01.07.1997
Subjects
CAROLINA DEL NORTE
CAROLINE DU NORD
CUCUMIS SATIVUS
CULTIVARS
DISEASE RESISTANCE
ENFERMEDADES FUNGOSAS
EVALUACION
EVALUATION
EXPERIMENTACION EN CAMPO
EXPERIMENTATION AU CHAMP
FIELD EXPERIMENTATION
FUNGAL DISEASES
GENETIC RESOURCES
GERMOPLASMA
GERMPLASM
MALADIE FONGIQUE
NORTH CAROLINA
PLANT RESOURCES
PSEUDOPERONOSPORA CUBENSIS
RECURSOS GENETICOS
RECURSOS VEGETALES
RESISTANCE AUX MALADIES
RESISTENCIA A LA ENFERMEDAD
RESSOURCE GENETIQUE
RESSOURCE VEGETALE
VARIEDADES
VARIETE
VARIETIES
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Summary:Downy mildew [Pseudoperonospora cubensis (Berk. and Curt.) Rostov] is an important disease in most cucumber (Cucumis sativus L.) production areas of the world. Resistant cultivars are available, but higher levels of resistance are needed if yield losses are to be avoided. The objective of this experiment was to evaluate all available plant introduction accessions (from the U.S. National Plant Germplasm System), cultivars, and breeding lines (hereafter collectively referred to as cultigens) of cucumber for downy mildew resistance under field conditions in North Carolina. All available cultigens were tested in four blocks (2 yr and two replications) under natural field epidemics of the disease. Mean ratings for downy mildew leaf damage ranged from 1.3 to 9.0 on a 0 to 9 scale. The most resistant nine cultigens originated from the USA, and were primarily adapted cultivars or breeding lines. The most resistant cultigens, for which multiple-year data were available, were Gy 4, 'Clinton', PI 234517, 'Poinsett 76', Gy5, 'Addis', M21, M27, and 'Galaxy'. The most susceptible cultigens for which multiple year data were available, were PI288995, PI176952, PI178886, and PI211985. We classified 17 cultigens as highly resistant (1.3-3.0), 87 as moderately resistant (3.3-5.0), 311 as moderately susceptible (5.3-7.0), and 248 as highly susceptible (7.3-9.0) for the 663 cultigens with multiple-year data. No plant introduction accessions were found to be more resistant than the most resistant elite cultivars and breeding lines tested
Bibliography:1997072002
F30
H20
ISSN:0011-183X
1435-0653
DOI:10.2135/cropsci1997.0011183X003700040050x